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April 26, 2015

Homework Help: statistics

Posted by stefanie on Sunday, May 2, 2010 at 11:43am.

2. The new Twinkle bulb has a standard deviation hours. A random sample of 77 light bulbs is selected from inventory. The sample mean was found to be 492 hours.
a. Find the margin of error E for a 90% confidence interval.
Round your answer to the nearest hundredths.

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